If you want to look at old farmland, fire up Google Earth and look at the bocage in Normandy. It must be the most famous old farmland around.
I think your map has gone from meh to quite good as the work progressed. I've never learned CC at all, so I don't know how you could get the ovelapping-fields-effect in CC2 but if you use slightly different colored polygons with some stroking or bush symbols over the edges... I dunno.
Keep up the good work.